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8 much swifter than Jack's. Already he had been allowed to go up unaccompanied and practice various evolutions that were in line with his steady advancement.

This altitude test was one of the last, just as it is possibly the most nerve-trying. Objects look so very strange when seen from a great distance up in the air; and the conditions surrounding the novice are so greatly in contrast with those closer to the earth, that the first trial trip is always watched with considerable solicitude by the instructor.

Jack heaved a sigh of relief when he discovered that his chum was finally coming down from the dizzy height. Both of them had become proficient in the highly important operation of shutting off the engine, pointing the nose of the airplane toward the earth, and volplaning swiftly downward.

It was one of the very first things they had learned, since it is hardly possible to make a safe landing without a perfect knowledge of this necessary art. Tom came rushing down with increased speed. The wind was whistling in his ears, and without his goggles he would have found it impossible to see on account of the tears the cold atmosphere would have forced into his eyes.

Adroitly, when the proper time came, he